Ore-smelting furnace



H. L. CHARLES.

ORE SMELTING FURNACE. APPLICATION FILED JAN. 23, 1920.

Lw iAy l. Patented m. 18, 1921'.

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ORE-SMELTING FURNACE.

Specification of Letters Patent.

Patented Oct. 18, 1921.

Application filed January 23, 1920. Serial No. 358,896.

To all whom it may concern:

Be it known that I, HENRY L. CHARLES,

a citizenof the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in ,Ore- Smelting Furnaces, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention relates to improvements in furnaces and more particularly has reference to smelting furnaces especially of the reverberatory type, and is particularly adapted to provide means in combination with'the furnace flue for minimizing the eating away of the brick work and for saving the waste heat therefrom. There is a fixed and definite relation between the flue area and grate area of such furnaces which should be. preserved as far as possible for the best working conditions, but owing to the intense heat and action of the hot gases from the furnace and the resultant eating away of the walls of the flue it is difiicult to maintain this relation and necessitates the frequent rebuilding of parts of the flue and walls thereofl whereas according to my invention this difliculty is not only minimized by water jacketing, but the heat absorbed thereby is turned to good account.

In the accompanying drawings, I have illustrated in Figure 1, the front end in iongitudinal section, parts being broken away of a suitable type of reverberatory furnace embodying an application of my invention. Fig. 2 is a cross sectional detail illustrating a modified arrangement of the water jacketing of the flue, and Fig. 3 is a cross sectional View on the line 33 of Fig. 1, parts being broken away.

Referring now more particularly to Figs. 1 and 3, the furnace gases travel leftwardly to the'front, of the furnace as indicated by the arrows passing upwardly over the ledge 4 shown to better advantage in Fig. 3 through the flue 5 to the stack. The front arched top portion 6 and side walls 7-7' and as the intensely heated gases" pass over' the ledge 4 and contact with the side walls and roof, the same are disintegrated and eaten away, thus varying the cross sectional area of the flue. One of the objects of my invention is to obviate this by applying heat absorbing means such as banks of tubes 8 provided with headers 9 suitably connected as shown and which may be embedded in the walls as illustrated so as to reduce the temperature thereof by absorbing a certain amount of the heat transmitted therethrough from the passing gases. If the steam generated is desired for power purposes the tubes may be connected substantially as shown and provided with a main feed pipe 10 connected to a boiler or steam drum 11 as shown, or as a modification chambers such as 12--13- may be formed upon the outside of the brick structure as shown in Fig. 2 through which water may be circulated to absorb the heat radiated from hot gases and this water maybe run off continuously or used for any special purpose.

14 indicates ,a suitable tank or other water receptacle which may be introduced beneath the throttle ledge 4 for cooling that portion of the furnace structure and may be connected to a continuously running stream of water or otherwise as may be found desirable, thus serving to cool the ledge 4 as shown. With an arrangement substantially as described it will be found that the refractory structure may be -maintained more or less intact for a considerably greater duration of time and the desired ratio of area between the flue and the furnace may be maintained more uniformly and continuously. Also by constructing the water jacketing structure in sectional units such as the banks of tubes as shown, any one portion thereof may be conveniently disconnected and removed without interference with the structure as a whole, thus rendering repairs and replenishing more convenient and economical.

: Of course it will be understood that various modifications may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

I claim:

1. In combination with a furnace of the class described and adjacent the throttle portion of the flue thereof, means forabsorbing part of the heat therefrom.

2. In combination with a furnace of the class described and adjacent the throttle portion of the flue thereof, means for maintaining a predetermined relative area between said throttle and the grate portion of said furnace.

In testimony whereof I hereunto affix my signature.

HENRY L. CHARLES. 

